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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e7eab37ac0b26b1ab27c4831a18bc95ebbda18b4493c8fed000997685f75723' 
  AND token = '5AtC/fbPU2OrkOQZzdwe0eEc52zz7Rs6VI7liy7mTaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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