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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc1b0a7f9508e5c2a5441e8ce7073f01490847b7abd836a297b3bb7c4acead25' 
  AND token = 'W5GaCjiXIreanRv1lOP/p25HyHHvbFE7gDCmGyQD+Gs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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