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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '072095ccde757e8b7584eb2ee081dd0766c331db60f7748b0a1f6c2b8165c37e' 
  AND token = 'Zu71JkqjIOD4P8410tOd7eQI2+IbOShHrCsL3ucSWMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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