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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c63c3606255bcc90b8a8297ec4115091b5d46eb8fad30c1e3b5d16949c413fb1' 
  AND token = 'whz3DhWbpLOK5J9yyC6ZKw2nlRrSbBZLulGGWb1jKaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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