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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2288c5472c401aafb2d30e5a2561029e4ccd55fbf322804caf127848f869c2ce' 
  AND token = '5+R0XeIbr+7ULczo5vuR+ntUOE7hnTrA+N0eKCIJnDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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