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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1d5b5c9e75aae90491a207493218d1ea4ed1585118db250ad17a4ab5705205a' 
  AND token = 'x1PbrVz9iFptqr6J1W1X54j6b6YwZNit0NOx3CmSoqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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