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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b1f63ef296b1406edac4aee9934461b415f947c2b29e0123ba5699591784fab' 
  AND token = 'al3OEuLhPAa4QdE88R8XMUCLvoRBqh3j7Aha6EEd0VI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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