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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b73b419c246e595e8426aabdda5269f1277eabbc24e47f05c6b960614e3948e' 
  AND token = 'jgj2JJHmFgUznPdq1d5kMPuUMww9xXgh45oo1jmLtDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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