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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6edf94473416170d539ea909902a8da68f6fad0d0d8109892505c4ec5ffd0ae' 
  AND token = 'LIN4yyNm2+Jtz5Sp5q2jm2aIpoZ3ex31FEz2eTGQ6eA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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