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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63371440003287591a220fe0cf95c9ffee744583702f84cbb0d47e1e59294700' 
  AND token = 'fmA01zyQpaGOs1/Z5Xg01KdlMHqAOHJtwv/EYxs9lPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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