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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a60c9eeadda6f9a2ef53197fc9395cdeca387ef4cf8903c32610e4f4ed87a37a' 
  AND token = 'PzZP98sw7kS5ZMYaLb1xMDo1PEBF73qxsXxRIrHyBmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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