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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85ae79e65b449772ef6c2764d331f9ad4f513bf2f158e816c7c893b601b03247' 
  AND token = 'dlIstS+Fs0EIZqWr1pI4/mKdh3okNiwn685/+6E8Cyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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