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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '395c1b2f3924a79fa9f73eae56b00c6d76c36d066d32e718b44de5215e3bb11e' 
  AND token = 'jXv1aNhrMS8oAUkEzuxM7bG7kJQFzm4t3IwH8mqolaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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