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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bffaf833211a9a8279d018e490f63b34e8c4eb795bcb97c1627b43bc53614da' 
  AND token = '6MHeeo1XfYqtF73EWOp5wRo0pxIl3deMt6cLLGLd5K0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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