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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5237142aae9690cc84ba19c5843f5a75bbf6daa0c70a6ef495c505c43ec86ff0' 
  AND token = 'lp2X02Rk4cL0VTn+BAe+jF9mD+Q+grd/GSe/0ooefIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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