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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43d015a2f1728010dcfb0f55b3e22aeb68122931e3a89fd87749d9799b18b62c' 
  AND token = 'yxNwKOTwmIy4HTxyqV4GTP1oh4KdiHxAldeBwHYHWEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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