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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71588bdb12beab40d9e7da69e8364e1443a19afdc0c5b800a2183e916efdfa2a' 
  AND token = 'JzvxDfxGM4u44mT8AkVc5ESpqdcdvLoAj5ikorzx0rQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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