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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb9e7ea9d58dbde4be2cc009188a00d66772684c9a30ea815c79ec203b1fe837' 
  AND token = '657piNBUvUu0wtGtIk75TB3Ob2kWQnpkqkqJRXSn2/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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