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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6d57853969874aabc3f844ff059f33a0d723e20f7dfdeb0840de5c300e3dc2c' 
  AND token = 'ycjfYEaFlI82ZJH7VV2Klov+g2c3RAamUEDiqQv6+no=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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