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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6741a7327143329cd111bd4d8cbff096971e56baf0ce272702a3b8610335bae5' 
  AND token = 'ZW7ObAk+SWfMlXw4hBn9WSXxQ5n/a9yvDN1guYqtaEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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