SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee6cec7724528bdfe57bbb3af7cbfcfd9b32925290355c07ef18dd6568f840f6' 
  AND token = 'svDZwliyt8OVHH2bORYjEdskXOd3I/Ge9CJWz+tJzxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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