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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd99fcfeffe11d3bb67d839ed9ae209f1511142625ae747fa51e2781809ebcc18' 
  AND token = 'ai/ALBYxB3meIHilR5pHMEBIz76p2YfjpDAxIbKKVUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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