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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f1bff262d198d36f36c370dc1a1b2f7127ed8f33ec20ffcc0c85185d59e70c0' 
  AND token = '7NNyGspZKcRD7FSCpOkHurwFNz6zJgJ7wrc5jKoAH80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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