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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '925b67bbb26651b596b45ab49fb0c7a9265634a2d95f9636e9c2aa69c0e4a7b9' 
  AND token = 'jliE2DFuFwgIQfh0/o3oGrRXFVe0JA1lEt6pcz6SsLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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