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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b9c9986f0f613e1bbac3149e8ef17390caa212b8498344195c5e80e5f508742' 
  AND token = 'msm1nfZzyJjF1oJr71ieAxiY4m9sLeqCi5T13cs0qCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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