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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ae186e9a9813c87a5a1881144fd1825f628f4d92d38f26d5e5858c192b3b2f1' 
  AND token = 'W37z3mEavaBsXbdGlVDhxNxaqBMaaINHmYruHSdEO9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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