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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b98e438c66d1b4bcfde6eb4feb8b6bb77487d11c96c02021670c6b3c1e578844' 
  AND token = 'oS0/9RI/rljnq/ycIaL3mqTU5biipiAZUVAuqla9muA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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