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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee209f767a9f99c0ad2d10a988e1156381137528a366ceef86982e5399252792' 
  AND token = '0kng5GGvUadga73Liyc/2EAze3BJAg2SXaFizDPcpG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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