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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce804cc65bed5789395c695b223a973f3aa72c40a956a73c1d7c75f1e68c93be' 
  AND token = '3+8OKFWRzW3QCopELXC9M5IFhlkZUL8KSQGsHH7fom8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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