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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81cba2ac11467c5c5aa808a09a7f53b29a8d95063b343e8bc6390d0fd268b944' 
  AND token = 'hir0j49/LB3acf2DeL59uxQoe1dmNp3b8Nn22WuwtXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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