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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '210c2cac9fe5ed9efe262e36938a5f547c4d0c4b47c005428c0d0d79bd901daa' 
  AND token = 'pxL/PXd8oFqd+ShMFQjxNKAABq515LG1LlqBDQXObZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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