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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e36bdf6d06e67782a3a1427a3166fe2ecffe667c8436f69fe31902524772cb2' 
  AND token = '23X0Hhv1zCtloUM/cwdoJPQx0ao+kX1kJIc5WRL0rVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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