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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18fa480d8e7bbbdbc6f5136aacb3f54cb7323ba30fa593bd535eacba4d934c36' 
  AND token = 'YjV3zVDanWPMV6ePOg4CvbN9zKis1dBxSPdlrBj1d44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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