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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78baa0574713984d5ed71f555588582c7b3337c413420802a3d7643f3bb7cf22' 
  AND token = 'huT1+iEWEGdWX127OO+de6fwi6asZLVWb38SAJJ4k90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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