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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1d2e57548d8931803837085f6c41cc9e18cac5d8b38af683c00d536073ee773' 
  AND token = 'BEbizipx1Yck0A3tNZONy1kOqcHCnhPQVvKRTrYQTic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00099

JSON explain

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