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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cc558722fc545284452baff87fe0de279d59722d8e77405bfa8a269be6a566c' 
  AND token = 'cyx7TcnCiOYEFniq7EviAb8tB3WL3kO5tFOw0Hg4sYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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