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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe57b3d2440c11a66d88303f2d64f6554c95dbec1c9d8f08d0ffd1cffb25c26a' 
  AND token = '/4E39EOT+kF0IgH3/0XtfmS6mAqTXmb5SpRLweXuKsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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