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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9f8d5a2395718ccdb665291b4d294e091dbc39049f2f95818453595ac61d5cd' 
  AND token = 'h0w6ic81n1XlHRSjnpOhqd97AjDTjkGEe3S2r9m+6YM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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