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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4da9bce50c587bd1a3db70c8cee224c52101fba77a7747391213d75bd2453419' 
  AND token = 'Or15I7DhCNEWduFXGEa6iIlM2p1E6UT0HgPkyTJ5DIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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