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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f2ec538dc99be9c2b8f78ade9212543fa1c7f4046519fc8356ce8cf8cbdcfb4' 
  AND token = '8dVTy1DwDy7u7MCTo5ERYgmB6mTNBkvGP9vat8qGLkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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