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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd3116c6f474457e23f53af7f9b93e121e5b606ba5c13e63251c0ed6df87e252' 
  AND token = 'xTv2i5amcGyVmXhW84aiac71vh/NHHNkm+NrDkXjzAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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