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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec5ee484a9adcd503e16da6c357dc82b5e828ba11bff095d74d4262d9faf13cf' 
  AND token = 'zhgMsXz3XyrZuI8zyubyfKWTikmGvWFTYE4RsfTf5Ew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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