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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2f90f9f1fec2bb52efec6380d652ca98f45ddc46590a83d3dfb3daf27f62d29' 
  AND token = 'ykcpdeikrWZRcJRa+2Pl43IJ4smwjSxBHlDV7WwUWQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}