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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3d28fe1cbd358cda01b44c3818282379fee6561f3ecf08b8cdabe615d7ab2e4' 
  AND token = '3D2DYLkPhy/0rdobpAUvrkAVzqV4e/jN4Da05QBzXnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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