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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24dca06e4bfe775c383ec1d64c7f95c6528435a637a35182f04a9f0d7aa52671' 
  AND token = 'BH9AS9M+dDwa8v5AoC15/NSkxws0LrazSkiiwp+oLsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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