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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '800af986813e194243b22cc370537baf56510e36d69509fe0940c17f76a2ad67' 
  AND token = 'ZAw6fWIgVA7Xlz8zoF6IYNGXw0RIWwy57V99N+vzAzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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