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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cba35f9bd240d8f5bb863134b75b0b8d91fff06769ecc9d6143b769ad948e1e' 
  AND token = 'YGdo/Q6c1q6DAmds60D4uoVVZKsb/9U45JB2bRxoweg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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