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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f734fb63b4902e629a8d5e885fd4437e60df533f4d7dda74bdc467e6dd087662' 
  AND token = 'N1JhPSNEQL5vL4Ggcn9Kwp0HPM5ngMBctboTo8mkwlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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