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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c4250d49b287b426d633ccfeaa91bb55c82a818ded20c3e52bc9d669ac488b4' 
  AND token = 'jUXKuwAmbT1FXbMm1yMeK22YCCBWF0ir06OTc6bU0i8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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