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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '136906b8f26c385c3ea79c10abfdf059d7b21ff5619361e38011eba5dc56356b' 
  AND token = 'nhyo8nvhfWadn6qSCB6wD9oJCJmMkSLR+4uY51m2onQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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