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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd43a5164ae6953d1b86d36a615696fc82bb321d298b8230f91fd39ff12109d79' 
  AND token = 'A2V9/V6QVp1uRdMXd0r3xVqV3BU8+cujp7mf1wkfkwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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