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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d23ac89a0312dd91ef58b26ce27a1ad3381de4c8e9f4b404237d4a6b80dfcd4' 
  AND token = 'Xw5gp94P1Bge1Ubwc+jdAUcnNa6w73psFdyR7bW9WC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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