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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32b2b784c2c20ad9e00693d6e4a725c7301280ee10da334bf0352dedb3422d94' 
  AND token = '1NO78gG2n17V5zRLq0m6M4yP6+R7RzXkpmQgMwKoKMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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