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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0da569e8cb626a0dd4de82550a931c4df33ddb93f527245ae8ae5988e099de9' 
  AND token = 'G9dvhg3+bIW0FjkiN1GlSOwh5foSlaq7yZSgo42cpWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00076

JSON explain

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