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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4081c7e7de1a7756ab5b9a418e1d3044cbad579de47bb9e87324f6baae034013' 
  AND token = 'klGwp76dLqLL+izk2sjy0VABxyKReYYNAqcLJmImb/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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