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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5077283fdefe815e5bf9ccd96ac599975ce80f6ecb2b3033fbe84b6b40c5336f' 
  AND token = 'ssc22liynzoe0GIJHnd7gBJrCWw1pDX0Sf0ugJTyj+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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