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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9a1a9cd3d7b4c2e200b1acfe1090f9dd901728ea567e112d8a839ee3880b29e' 
  AND token = '6TaJW8IYt3CG8rNhL8/FDVGc+bNarT9RDUUAJFG7zvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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