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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f774dd19d7d3dc6e335bdb241bc24e26b16c1355d29f6964c5bf4f7a05ab1a6' 
  AND token = 'QKoUgnVcVB259oRsrc4SDXEa3ucDOKaMYvBfgdhMIuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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