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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd13d3c058361d659d7f5e58666a202e5308fcf36d5c7590c3cd3688210dbb57c' 
  AND token = 'LdO24o+9hpvw2N9h2MeMxV3ceuB3Xn5DZUg4TXg1SIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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