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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0711ad334f7b4788fc4a1207faff9b11e585d98315cbf93f20ac56fc80ac529' 
  AND token = 'VW0jIylh3N0ntUI3GahrkEI8uqc+35+r7A3zOXLyWUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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