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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25b2b3ec2350176a7f37ddbcf8ed797db2edb559994f75a7c9be586de7765b9d' 
  AND token = '/06DLe9pF10O9CS8XLZXet4ayeW3M6cOCo3tGSUHKK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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