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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a91d47f924dc0ab426169652678ae9b0b982ae3f8fb80c760f3f53eef3312c5d' 
  AND token = 'EOZO041OV1uEBDwA7DiGc5t/zcsuA0rMpkRIh+9ejk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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