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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c8dbb2c970ec059fdf46fd8dc43ca9a9859107f326bdbf02add7eea7e30d76e' 
  AND token = '2j8W8rj9kPl5VKf7Nwd00AtoXLTtCYc0iJAlSyFBk30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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