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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c01b4ec73da3067aa876695e6b944b4bb3f0470bdf0ffe75579f5dafca9f4f9' 
  AND token = 'hcelZ1l1oNZ93+aycaBbnmvRy0B4y96mlBqYvOzyjMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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