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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '317bbacc574ce9b89ecc748b658142675f9e52ffd78feec5b7cd7f6520a54f2f' 
  AND token = 'qEyRp0Fsp57vDkZ3cFM2fC7ISYm3KRxpADo9/KJbY4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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