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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcdc481608838f02fdb345dc3b21afa1255ca62d1e352990ef33dfbb593c7156' 
  AND token = 'Kcv6GkOA56/EOyMZx6XfBm2MqacOKYSQSvAGgmTDV1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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